WORLD TRADE  
ORGANIZATION  G/TBT/N/CHN/139 
18 August 2005 
 
 (05-3680) 
Committee on Technical Barriers to Trade Original:  English  
  
 
NOTIFICATION 
 
The following notification is being circ ulated in accordance with Article 10.6. 
 
1. Member to Agreement notifying:   THE PEOPLE’S REPUBLIC OF CHINA
 
If applicable, name of local government involved (Articles 3.2 and 7.2):         
2. Agency responsible:   Standardization Administration of China (SAC) 
Name and address (including telephone and fax numbers, e-mail and web-site 
addresses, if available) of  agency or authority designated to handle comments 
regarding the notification shall be  indicated if different from above:         
3. Notified under Article 2.9.2 [  X ], 2.10.1 [   ], 5.6.2 [   ], 5.7.1 [   ], other:         
4. Products covered (HS or CCCN where applicable, otherwise national tariff heading. 
ICS numbers may be provided in  addition, where applicable):   Electrolytic machine 
tools (ICS:  120.40;  HS:  845690) 
5. Title, number of pages and langu age(s) of the notified document:   National Standard of 
the P.R.C., Electrolytic Machine Tools - Technical Requirement for Safeguarding 
(11 Pages, in Chinese) 
6. Description of content:   This standard specifies the safety requirements and measures, 
information for using, and the inspection of the safeguarding requirements for electrolytic 
machine tools.  It applies to the equipmen ts used in the process of electrochemical 
machining (ECM), such as electrochemical sinking machine (working voltage ≤ 60V DC), 
electrochemical polishing machine, electroch emical deburring machine, electrochemical 
cutting, electrochemical lathe, electrochemical  grinding machine, electrochemical etching 
machine and other ECM machines.  The safet y requirements and measures of the above 
mentioned machines shall meet the following requirements: 
1. Mechanical hazard and safeguarding 1.1  Impact hazard shall be prevented when  emergency stop or power and /or control 
signal breaking off.  
1.2 The cathode clamp of tools shall be safe and reliable. 
1.3  The door/cover shall be interlocked with the electrolyte supply system, where there 
is electrolyte splashing. 
1.4  Machining process shall be stopped or coul d not be started when the interlock of the 
safeguarding device is open. 
1.5 The machine tools shall use double ram stroke limiting devices. G/TBT/N/CHN/139 
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2. Safeguarding devices 
 The removable safeguarding device sha ll be installed and dismantled easily. 
3. Control system and devices 3.1 No hazard shall be occurred if the contro l signal carrier is broken off or damaged. 
3.2  Error tolerance shall be designed for pa rts of control system that is easy to be 
mis-operated. 
3.3  Emergency stop device shall be provided at each working station. 4. Electrical hazards and protection 4.1   Dual over-current protection device shall be provided for electrochemical sinking 
machine. 
4.2  Anticorrosion measures shall be taken fo r naked conductor out of electrical cabinet. 
4.3   Insulation between machine and workpiece shall be reliable.  Insulating resistance 
shall be in accordance with  19.3 of GB 5226.1-2002. 
4.4   The protection grade provided by the electrical cabinet shall be in accordance with 
12.3 of GB 5226.1-2002.  
5. Electrolyte system 
5.1   The electrolyte circulation and filtrati on system shall not have any sign of leakage. 
  Electrolyte shall not splash or drop out of the machine.  
5.2  The electrolyte heating device and the h eating measure taken shall not produce 
additional hazard. 
5.3  The drainage of the electrolyte and its  dregs shall be in accordance with relevant 
national rules for environmental protection. 
6. Baneful gas prevention 6.1  Baneful gas and electrolyte fog pro duced during the processing shall be let off 
effectively in accordance with relevant na tional rules for environmental protection. 
6.2  Checking and protecting devices for ventilation missing shall be equipped for 
machines in which mechanical ventilation measure is adopted. 
7. Anti-corrosion protection 7.1  Anti-rust and anti-corrosion protection measure shall be taken for the important 
parts of the machine tools. 
7.2  The surface of the bus bar shall be corrosion proofed. 
7.3  Parts directly contacted with electrolyte shall be made of corrosion-proof material.  G/TBT/N/CHN/139 
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7.4   Parts of ventilation pipeline, fan a nd pipe connection shall be made of corrosion-
proof material. 
8. Noise 9. Lighting 
7. Objective and rationale, including the na ture of urgent problems where applicable:  
For the protection of human safety 
8. Relevant documents:   - 
9. Proposed date of adoption:  90 days after circulation by WTO Secretariat  
Proposed date of entry into force: 6 months after adoption 
10. Final date for comments:   60 days after circulation by WTO Secretariat 
11. Texts available from:  National enquiry point [  X ] or address, telephone and fax 
numbers, e-mail and web-site addresses, if available of the other body:        
WTO/TBT National Notification and Enquiry Center of the People’s Republic of China 
 
Tel: (+86) 10 82260618 Fax: (+86) 10 82262448 E-mail: tbt@aqsiq.gov.cn